Phenol Red Galactose Broth is used for galactose fermentation studies of microorganisms. It is recommended to determine the fermentation reaction of carbohydrates for the differentiation of microorganisms. This medium with various carbohydrates serves as a differential medium by aiding in differentiation of various species and genera by their ability to ferment the specific carbohydrate, with the production of acid or acid and gas. It is used to study galactose fermentation in various bacteria.